juce_ImageFileFormat.cpp

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 /*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy
 
   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).
 
   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.
 
  ==============================================================================
*/
 
namespace juce
{
 
struct DefaultImageFormats
{
    static ImageFileFormat** get()
    {
        static DefaultImageFormats formats;
        return formats.formats;
    }
 
private:
    DefaultImageFormats() noexcept
    {
        formats[0] = &png;
        formats[1] = &jpg;
        formats[2] = &gif;
        formats[3] = nullptr;
    }
 
    PNGImageFormat  png;
    JPEGImageFormat jpg;
    GIFImageFormat  gif;
 
    ImageFileFormat* formats[4];
};
 
ImageFileFormat* ImageFileFormat::findImageFormatForStream (InputStream& input)
{
    const int64 streamPos = input.getPosition();
 
    for (ImageFileFormat** i = DefaultImageFormats::get(); *i != nullptr; ++i)
    {
        const bool found = (*i)->canUnderstand (input);
        input.setPosition (streamPos);
 
        if (found)
            return *i;
    }
 
    return nullptr;
}
 
ImageFileFormat* ImageFileFormat::findImageFormatForFileExtension (const File& file)
{
    for (ImageFileFormat** i = DefaultImageFormats::get(); *i != nullptr; ++i)
        if ((*i)->usesFileExtension (file))
            return *i;
 
    return nullptr;
}
 
//==============================================================================
Image ImageFileFormat::loadFrom (InputStream& input)
{
    if (ImageFileFormat* format = findImageFormatForStream (input))
        return format->decodeImage (input);
 
    return Image();
}
 
Image ImageFileFormat::loadFrom (const File& file)
{
    FileInputStream stream (file);
 
    if (stream.openedOk())
    {
        BufferedInputStream b (stream, 8192);
        return loadFrom (b);
    }
 
    return Image();
}
 
Image ImageFileFormat::loadFrom (const void* rawData, const size_t numBytes)
{
    if (rawData != nullptr && numBytes > 4)
    {
        MemoryInputStream stream (rawData, numBytes, false);
        return loadFrom (stream);
    }
 
    return Image();
}
 
} // namespace juce